As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE MESSAGE ON APPROACH NOSE GEAR DID NOT DROP MANUAL EXTENSION PERFORMED AS PER QRH / REMOVED AND REPLACED NLG DOWNLOCK-ACTUATOR IAW CRJ900 AMM 32-32-08-000/400-801-A01. LANDING GEAR EXTENSION/RETRACTION SYSTEM OPS TESTED GOOD. REMOVED AND REPLACED PSEU IAW CRJ900 AMM 32-61-01-000/400-801-A01. OPS TESTED GOOD. SUCCESSFUL LANDING GEAR EXTENSION/RETRACTION SYSTEM OPS TEST.